AutoCodes – Honda – P16C4 Honda

P16C4 Honda Code - Engine Mount Actuator Control Power Circuit Stuck Off

Quick Answer

The engine mount control system controls the engine mounts electronically. Common causes include Faulty Engine Mount Actuator, Engine Mount Actuator harness is open or shorted, Engine Mount Actuator circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P16C4 Honda indicates Engine Mount Actuator Control Power Circuit Stuck Off.
Common causes: Common causes include Faulty Engine Mount Actuator, Engine Mount Actuator harness is open or shorted, Engine Mount Actuator circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 12,754

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 10, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P16C4 Honda Description

The engine mount control system controls the engine mounts electronically. The system consists of the engine mount actuators, the engine mount control unit, and the Powertrain Control Module (PCM). The engine mount control unit uses the crankshaft and camshaft position sensor outputs (received from the PCM) to estimate engine vibration. The engine mount control unit then sends signals to the engine mount actuators to command the engine mounts to push and pull on the engine to counteract engine vibration. The engine mount control unit monitors the engine mount control unit voltage. If the ACM RLY OUT voltage is set value or less for a set time, the engine mount control unit detects a malfunction and stores a DTC.

OBDII Code P16C4 Honda - Engine Mount Actuator Control Power Circuit Stuck Off - AutoCodes.com — P16C4 Honda Code - Engine Mount Actuator Control Power Circuit Stuck Off

What does this mean?

What are the Possible Causes of the DTC P16C4 Honda?

Faulty Engine Mount Actuator
Engine Mount Actuator harness is open or shorted
Engine Mount Actuator circuit poor electrical connection
Faulty Engine Mount Control Unit

How to Fix the DTC P16C4 Honda?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P16C4 Honda code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P16C4 Honda Code

1. What does the OBDII code P16C4 indicate on a Honda?

The P16C4 code in a Honda indicates an issue with the Engine Mount Actuator Control Power Circuit being stuck off, suggesting a malfunction in the engine mount system's electrical circuit.

2. What are the common symptoms of code P16C4 in a Honda?

Symptoms include increased engine vibration, unusual noises during acceleration or idling, and possibly a decrease in fuel efficiency. The check engine light will also be illuminated.

3. What causes the P16C4 code to appear on a Honda?

Potential causes include faulty engine mount actuators, damaged wiring or connectors in the engine mount control circuit, or a malfunctioning engine control module (ECM).

4. How can I diagnose the problem leading to a P16C4 code in my Honda?

Diagnosis involves using an OBDII scanner to confirm the code, visually inspecting the engine mount actuators and associated wiring for damage, and checking the electrical connections for poor contacts or corrosion.

5. What are the steps to fix the P16C4 code in a Honda?

Repair steps typically include replacing faulty engine mount actuators, repairing or replacing damaged wiring, and ensuring all connections are secure. In some cases, reprogramming or replacing the ECM may be necessary.

6. Is it safe to drive my Honda with the P16C4 code active?

While you may not experience immediate drivability issues, continued driving with this error can lead to increased wear on engine components and potentially more serious mechanical issues. It's advised to address the problem as soon as possible.

7. What tools are needed to resolve the P16C4 code on a Honda?

Repairing this issue may require a digital multimeter for testing electrical connections, a scanner for diagnosing the code, and basic hand tools to access and replace components.

8. Can a faulty ECM cause the P16C4 code in a Honda?

Yes, a malfunctioning ECM can incorrectly regulate or interpret signals from the engine mount actuators, leading to the P16C4 code. This should be considered, especially if other electrical issues or codes are present.

9. How do I prevent the P16C4 code from recurring in my Honda?

Preventive measures include regular vehicle maintenance, ensuring that the engine mounts and their control circuits are inspected during routine check-ups, and addressing any signs of wear or damage immediately.